Think of your Google My Business page as a mini website. It must be fed with content to keep it relevant. Google will send reminders when they think you need to post new content.
How To Use Google My Business As A Lead Generation Tool
What's New - This is a great medium to promote blog content, white papers or announcements.
Events - promote your open house, webinar, trainings, etc.
Offers - coupons, specials, sales, etc.
Product - what you have and what it costs.
Think of your Google My Business page as a mini website. It will need fresh content and management. It is not a "set it and forget it" platform. The good news is that Google will send you a reminder when you need fresh content.
At Analytics That Profit, we are convinced that Google My Business must be a part your SEO and Lead Generation strategy. We include Google My Business page optimization and management with every client retainer. We have seen the results firsthand for our clients.